package com.qingcheng.service.impl;

import com.alibaba.dubbo.config.annotation.Reference;
import com.alibaba.dubbo.config.annotation.Service;
import com.qingcheng.pojo.goods.Category;
import com.qingcheng.pojo.goods.Sku;
import com.qingcheng.pojo.order.OrderItem;
import com.qingcheng.service.goods.CategoryService;
import com.qingcheng.service.goods.SkuService;
import com.qingcheng.service.order.CartService;
import com.qingcheng.service.order.PreferentialService;
import com.qingcheng.util.CacheKey;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;

import java.util.*;
import java.util.stream.Collectors;

@Service
public class CartServiceImpl implements CartService{

    @Autowired
    private RedisTemplate redisTemplate;

    @Reference
    private SkuService skuService;

    @Reference
    private CategoryService categoryService;

    @Autowired
    private PreferentialService preferentialService;

    /**
     * 从redis中提取某个用户的购物车
     * @param username 用户名
     * @return
     */
    @Override
    public List<Map<String, Object>> findCartList(String username) {
        System.out.println("从redis中提取购物车"+username);
        List<Map<String, Object>> cartList = (List<Map<String, Object>>)redisTemplate.boundHashOps(CacheKey.CART_LIST).get(username);
        if(cartList == null){
            cartList = new ArrayList<>();
        }
        return cartList;
    }

    /**
     * 添加商品到购物车
     * @param username 用户名
     * @param skuId 商品id
     * @param num 数量
     */
    @Override
    public void addItem(String username, String skuId, Integer num) {
        //思路: 遍历购物车,如果存在该商品则累加数量,如果不存在则添加商品
        //获取购物车
        List<Map<String, Object>> cartList = findCartList(username);

        boolean flag = false;//是否在购物车存在
        for (Map<String, Object> map : cartList) {
            OrderItem orderItem = (OrderItem) map.get("item");
            if (orderItem.getSkuId().equals(skuId)){ //购物车存在该商品
                if (orderItem.getNum() <= 0){
                    cartList.remove(map);
                    flag = true;
                    break;
                }
                int weight = orderItem.getWeight()/orderItem.getNum();

                orderItem.setNum(orderItem.getNum()+num);//数量变更
                orderItem.setMoney(orderItem.getPrice()*orderItem.getNum());//金额变更
                orderItem.setWeight(weight*orderItem.getNum());//重量变更

                if (orderItem.getNum() <= 0){
                    cartList.remove(map);
                }
                flag = true;
                break;
            }
        }

        //如果购物车中没有该商品,则添加
        if (flag == false){

            Sku sku = skuService.findById(skuId);
            if (sku == null){
                throw new RuntimeException("商品不存在!");
            }
            if (!"1".equals(sku.getStatus())){
                throw new RuntimeException("商品状态不合法!");
            }
            if (num <= 0){ //数量不能为0或负数
                throw new RuntimeException("商品数量不合法!");
            }
            OrderItem orderItem = new OrderItem();

            //商品分类
            orderItem.setCategoryId3(sku.getCategoryId());
            Category category3 = (Category)redisTemplate.boundHashOps(CacheKey.CATEGORY).get(sku.getCategoryId());
            if (category3==null){
                category3 = categoryService.findById(sku.getCategoryId());//根据三级分类id查询2级
                redisTemplate.boundHashOps(CacheKey.CATEGORY).put(sku.getCategoryId(),category3);
            }
            orderItem.setCategoryId2(category3.getParentId());
            Category category2 = (Category)redisTemplate.boundHashOps(CacheKey.CATEGORY).get(category3.getParentId());
            if (category2==null){
                category2 = categoryService.findById(category3.getParentId());//根据二级分类id查询1级
                redisTemplate.boundHashOps(CacheKey.CATEGORY).put(category3.getParentId(),category2);
            }
            orderItem.setCategoryId1(category2.getParentId());

            orderItem.setSkuId(skuId);
            orderItem.setSpuId(sku.getSpuId());
            orderItem.setNum(num);//数量
            orderItem.setImage(sku.getImage());//图片
            orderItem.setPrice(sku.getPrice());//单价
            orderItem.setName(sku.getName());//商品名称
            orderItem.setMoney(orderItem.getPrice()*num);//金额计算
            if (sku.getWeight()==null){
                sku.setWeight(0);
            }
            orderItem.setWeight(sku.getWeight()*num);//重量计算

            Map map = new HashMap();
            map.put("item",orderItem);
            map.put("checked",true);//默认选中

            cartList.add(map);
        }
        redisTemplate.boundHashOps(CacheKey.CART_LIST).put(username,cartList);
    }

    /**
     * 更新选择状态
     * @param username
     * @param skuId
     * @param checked
     * @return
     */
    @Override
    public boolean updateChecked(String username, String skuId, boolean checked) {

        List<Map<String, Object>> cartList = findCartList(username);
        boolean isOk = false;
        for (Map<String, Object> map : cartList) {
            OrderItem orderItem = (OrderItem) map.get("item");
            if (orderItem.getSkuId().equals(skuId)){
                map.put("checked",checked);
                isOk = true;
                break;
            }
        }
        if (isOk){
            redisTemplate.boundHashOps(CacheKey.CART_LIST).put(username,cartList);
        }
        return isOk;
    }

    /**
     * 删除选择购物车
     * @param username
     */
    @Override
    public void deleteCheckedCart(String username) {
        //获得未选中购物车
        List<Map<String, Object>> cartList = findCartList(username).stream()
                .filter(cart -> (boolean) cart.get("checked") == false).collect(Collectors.toList());
        redisTemplate.boundHashOps(CacheKey.CART_LIST).put(username,cartList);
    }

    /**
     * 计算购物车的优惠金额
     * @param username
     * @return
     */
    @Override
    public int preferential(String username) {
        //获取选择的购物车 List<OrderItem> List<Map>
        List<OrderItem> orderItemList = findCartList(username).stream()
                .filter(cart -> (boolean) cart.get("checked") == true)
                .map(cart -> (OrderItem) cart.get("item"))
                .collect(Collectors.toList());

        //按照分类聚合统计每个分类的金额   group by
        // 分类 金额
        //  1   120
        //  2   500
        Map<Integer, IntSummaryStatistics> cartMap = orderItemList.stream()
                .collect(Collectors.groupingBy(OrderItem::getCategoryId3, Collectors.summarizingInt(OrderItem::getMoney)));

        //循环结果,统计每个分类的优惠金额,并累计
        int allPreMoney = 0;//累计优惠金额
        for (Integer categoryId:cartMap.keySet()){
            //获取品类的消费金额
            int money = (int)cartMap.get(categoryId).getSum();
            int preMoney = preferentialService.finPreMoneyByCategoryId(categoryId, money);//获取优惠金额
            System.out.println("分类:"+categoryId+"  消费金额:"+money+"  优惠金额:"+preMoney);

            allPreMoney += preMoney;
        }
        return allPreMoney;
    }

    /**
     * 最新购物车列表
     * @param username
     * @return
     */
    @Override
    public List<Map<String, Object>> findNewOrderItemList(String username) {

        //获取购物车
        List<Map<String, Object>> cartList = findCartList(username);

        //循环购物车 刷新价格
        for(Map<String,Object> cart:cartList){
            OrderItem orderItem=(OrderItem)cart.get("item");
            Sku sku = skuService.findById(orderItem.getSkuId());
            orderItem.setPrice( sku.getPrice());//更新价格
            orderItem.setMoney(sku.getPrice()*orderItem.getNum());  //更新金额
        }
        //保存最新购物车
        redisTemplate.boundHashOps(CacheKey.CART_LIST).put(username,cartList);

        return cartList;
    }
}
